president obama marked world aids day at the white house just a short while ago, announcing some new research initiatives and giving credit to those who have fought for progress against the disease. >> it's the result of countless people, including so many of you working together. >> one of the people in the room sitting in a plum seat in the front row was microsoft co-founder bill gates, the co-chairman and trustee of the bill and melinda gates foundation, which has committed billions to hiv research and grants. he and his wife were just listed number one on the forbes list of america's top giveres, nearly $2 billion in 2012 alone. bill gates was kind enough to leave the white house to join us now. i really appreciate it. we have better hors d'oeuvres anyway. thank you for being here. >> great to be here. >> i want to start with your friend bono who has worked with you on the aids issue. he had some comments which raised some eyebrows over the weekend. this is what he said about the fight against aids. let's listen. >> there's a chance of having the first aids-free generation by 201